Organic Cotton Micro Twill Ivory
You may say "Is it really a twill?" because it is lightweight and unless your eyesight is good, you won't see the twill weave. It does mean that this fabric has strength beyond it's weight, and has the bonus of good bias stretch without distortion. Light enough for a shirt or cot sheet, but not see-through. Firm enough for a bag but with good drape. Do get a sample and have a good feel.